The removal of methylene blue(BM) through adsorption over the commercial actived charcoal ( CECA 40) was studied in a static batch reactor. At constant pH and temperature the adsorption
equilibrium time is equal to 5 hours regardless of the initial concentration of metylene blue (BM). The adsorption in this case follows a Langmuir isotherm of the first type with an ultimate
adsorption capacity of about 367,6 mg of methylene blue for each gram of CECA 40. Moreover, we observed no significant influence of temperature on the adsorption equilibrium. The adsorption
and the Intraparticular diffusion kinectics were studied. Adsorption is clearly higher in an alcaline environment than in the acid one. This adsorption is further improved by the use of finer
granulometry.